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Equipment Discussions >> Refractors

Pages: 1
Leebert
newbie


Reged: 04/17/13

Which 4"refractor for mainly astrophotography? new
      #5867476 - 05/17/13 03:57 PM

I am considering a 4" or so refractor to set up an imaging rig on an HEQ5 Pro with a William Optics 66SD for a guide scope. I have had a look around and have a list of OTAs that look like they might suit the task.
They are...
Altair Wave Series 102mm F7 Super ED Triplet APO (102/715);
TS PHOTOLIN'E 102mm f/5,2 Flatfield Super APO telescope;
APM 107/700 F6.5 Super ED Triplet APO w 3" APM focuser;
William Optics FLT 98 APO Triplet;
Skywatcher Esprit ED 100 PRO 5-element.

These vary from about £1400 to £2300.

My budget is around £1700 but could increase for the right OTA (and flattener/reducer if required).

I only want to buy once and am prepared to wait. I am a relative newbie where Astrophotography and refractors are concerned. Looking at the short list, i have a few concerns from looking around the internet...
Altair - a bit slow at f7 and no dedicated reducer yet?
TS 102 - not found any reviews etc on them?
WO - Recent quality / build issues concern me.
Esprit 100 - Really stretches my budget and they don't seem to be in stock anywhere.

I would be interested in peoples thoughts on these or any other scopes...

Many thanks,
Lee


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CounterWeight
Postmaster
*****

Reged: 10/05/08

Loc: Palo alto, CA.
Re: Which 4"refractor for mainly astrophotography? new [Re: Leebert]
      #5868604 - 05/18/13 01:12 AM

Something small ~80mm and fast (f/6) with a flattener would be my recommendation. The 'quads' IMO are outstnding for imaging as you don't need to fudge with spacer rings / backdistances required for flatteners, and resulting long imaging trane hanging on the focuser. Just attach camera or CCD, focus, and start collecting photons. E-Z. If there is one of those that has a (dedicated?) reducer to take it below f/6 into the f/5 or faster (and has a great focuser) that too would be a great option. In my link below you'll see images from various scope/flattener / reducer combinations to get an idea what the field / resolution is like using an 8300 chip for reference.

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Leebert
newbie


Reged: 04/17/13

Re: Which 4"refractor for mainly astrophotography? new [Re: CounterWeight]
      #5868648 - 05/18/13 02:06 AM

I had initially discounted the 80mm OTAs as they seem to me to be a bit close to the 66 I already have - hence looking at around 4". Similarly, I don't want to go much larger due to the capacity of the HEQ5 and the capacity of my wallet
Thanks for the link - some fantastic images there. It gives me a good idea of the FOV available with the different combinations with a chip size that is similar to mine.
Regards,
Lee


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Varun_India
member


Reged: 09/10/12

Loc: India
Re: Which 4"refractor for mainly astrophotography? new [Re: Leebert]
      #5868663 - 05/18/13 02:18 AM

I also have an HEQ5 pro & similarly looking for a 4" refractor for astrophotography.
My budget is around $1500 & I had shortlisted "Explore Scientific 102mm f/7 Triplet Apo in Carbon fiber" which retails for $1499. Being carbon fiber this scope is really light & would be a good match for HEQ5.
Have you considered this scope, reviews seem good.
I am yet to purchase this refractor so can't give u any reviews.


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chaoscosmos
sage
*****

Reged: 01/26/13

Loc: Mission Viejo CA
Re: Which 4"refractor for mainly astrophotography? new [Re: Varun_India]
      #5868682 - 05/18/13 02:36 AM

NP-101, TV101...... either one or the other come up used fairly regularly.

Edited by chaoscosmos (05/18/13 02:38 AM)


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PhilCo126
Post Laureate


Reged: 01/14/05

Loc: coastline of Belgium
Re: Which 4"refractor for mainly astrophotography? new [Re: chaoscosmos]
      #5868776 - 05/18/13 04:48 AM

Good choice: TS PHOTOLIN'E 102mm f/5,2 Flatfield Super APO telescope;

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FTLAUDSKY
member
*****

Reged: 01/21/13

Re: Which 4"refractor for mainly astrophotography? new [Re: PhilCo126]
      #5874468 - 05/20/13 07:09 PM

I have a FLT98 and love it. Optics are amazing!! I did have to adjust the tension on the focuser, but works great now. I believe WO has one for sale. The FLT98 and the super rare 158 lens were made in Russia. Top notch clarity in my opinion. I bought mine used and I happy with the price I paid. I saw on another site they have a R&P focuser coming out with new ones. If you have the opportunity to pick a used one up don't hesitate. There are tons of scopes in the 4" APO category. Since your in Europe look at the APM/Altair scopes. Have no experience with them, but they seem like a good deal.

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wolfman_4_ever
Pooh-Bah


Reged: 07/15/11

Loc: El Segundo, Ca, So. Cal
Re: Which 4"refractor for mainly astrophotography? new [Re: FTLAUDSKY]
      #5874520 - 05/20/13 07:39 PM

TV101is. flatner already built in.

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TimN
Pooh-Bah


Reged: 04/20/08

Loc: Ontario, Canada
Re: Which 4"refractor for mainly astrophotography? new [Re: wolfman_4_ever]
      #5874707 - 05/20/13 09:13 PM

I have a SkyWatcher 120mm ED on an HEQ5 Pro that I use for imaging. Its f7.5 but I also have an .85x focal reducer. I've been very pleased with the setup.

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timmbottoni
Carpal Tunnel


Reged: 08/25/05

Loc: W Chicago suburbs, IL USA
Re: Which 4"refractor for mainly astrophotography? [Re: TimN]
      #5874934 - 05/20/13 11:15 PM

If you would consider the WO GTF102, I can tell you that you will be very pleased for AP work. I am starting to write a full review now, and I am amazed at the optics on mine.

Timm


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Panotaker
sage


Reged: 09/12/03

Loc: Austin, Texas
Re: Which 4"refractor for mainly astrophotography? new [Re: timmbottoni]
      #5875372 - 05/21/13 09:28 AM

I would go for a used NP-101. The IS version is nice, but thousands of photos have been taken through the regular NP-101. They come up for sale all the time for about half the price of a new one, and like must stuff from Televue, they last forever.

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snommisbor
scholastic sledgehammer
*****

Reged: 06/15/09

Loc: Cedar Park, TX
Re: Which 4"refractor for mainly astrophotography? new [Re: Panotaker]
      #5875595 - 05/21/13 11:22 AM

+1 on the NP-101 or even a TV-101, the version before the NP. I had the TV 101 and it was great. I actually sold it for more than I paid. They are the best deal out there on the used market. I actually dont understand why they depreciate so much from a new price but they do. So I would go the used route and never look back then when you move up you can sell again and probably not lose much if any on resale. Pretty much a risk free purchase.

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chaoscosmos
sage
*****

Reged: 01/26/13

Loc: Mission Viejo CA
Re: Which 4"refractor for mainly astrophotography? new [Re: snommisbor]
      #5875611 - 05/21/13 11:31 AM

I got a used TV101 for $1700 and the objective lens is pristine. Got lucky on that one. Love it.

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